/**
 *   Copyright (C) ${year} Wicket Continuous Calendar (http://Wicket-Continuous-Calendar.GoogleCode.com/)
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 */
package com.googlecode.wicketcontinuouscalendar.options;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class Function implements Serializable {
    private static final long serialVersionUID = 1L;

    private String function;
    private final List<String> parameters = new ArrayList<String>();

    public Function() { }

    public Function(final String functionBody) {
        this.function = functionBody;
    }

    public String getFunction() {
        String result = getSignature();
        result += "{";
        if (this.function != null) {
            result += this.function;
        }
        result += "}";
        return result;
    }

    public Function setFunction(final String functionBody) {
        this.function = functionBody;
        return this;
    }

    /**
     * With this function, you can add parameters to the signature of the
     * JavaScript function. All parameters added with this method will be included
     * as parameters in the rendered function call.
     * 
     * @param parameter
     *          the name of the parameter.
     */
    protected void addParameter(String parameter) {
        this.parameters.add(parameter);
    }

    private String getSignature() {
        if (this.parameters.isEmpty()) {
            return "function()";
        } else {
            String signature = "function(";
            boolean first = true;
            for (String param : this.parameters) {
                if (!first) {
                    signature += ",";
                }
                signature += param;
                first = false;
            }
            signature += ")";
            return signature;
        }
    }

}
